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Summary:
Xcode 5 Beta 5 crashes when jumping to definition from a Swift file, when "OTHER_SWIFT_FLAGS" build setting include "-D <#flag#>". A sample crash file is attached.

Steps to Reproduce:
1. Install Xcode 6 Beta 5 (6A279r)
2. Create a new Swift project (let's use any template under iOS Applicaton category)
3. Open the primary target's build settings
4. Set the following setting for Debug configuration: OTHER_SWIFT_FLAGS = -D DEBUG
5. Open the generated AppDelegate.swift file and command-click on any external symbol (e.g. UIResponder)

Expected Results:
Xcode jumps to the "swiftified" version of the symbol definition (e.g. UIResponder).

Actual Results:
Xcode crashes with a failed assertion.

Version:
Xcode 6.0 Beta 5 (6A279r)
OS X 10.9.4 (13E28)
MacPro5,1

Notes:
Using "OTHER_SWIFT_FLAGS = -D" (without the flag name after "-D") results in "Symbol not found" HUD error after a command-click.

Configuration:
1. Issue occurs only when "-D <#flag#>" is the value of OTHER_SWIFT_FLAGS setting.
2. A similar issue occurs when using "-D" without the flag name (more information in Additional Notes).

Attachments:
'Xcode_2014-08-05-190345.crash' was successfully uploaded.

--- 28-Aug-2014 07:46 PM

Issue has been fixed in Xcode 6.0 Beta 6 (6A280e).

This issue has been verified as resolved and can be closed.